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NC 143 begins at the Tennessee state line at Beech Gap, along the Unicoi Crest. For the next eighteen miles (29 km), known as the Cherohala Skyway, the highway stays along mostly the north-side of the Johns Knob, Little Haw Knob, Haw Knob, Hooper Bald, and Cedar Top, before descending at the Santeetlah Gap. The overall driving experience is similar to the Blue Ridge Parkway; it has the same maximum speed of 45 mph (72 km/h), and during winter the road is not maintained against snow and ice.[citation needed] At Snowbird Road, NC 143 Business begins going at a southerly route, through Milltown, into Robbinsville, as the mainline goes north.

The next eleven miles (18 km) of highway is completely different, as NC 143 goes along the southern banks of Lake Santeetlah, which has a lot of twist and turns, though not much on elevation changes. North of Robbinsville, it joins a concurrency with US 129 as it goes south into town. Within the town limits, the highway is called the Rodney Orr Bypass, named in honor of NASCAR driver Rodney Orr (approved on April 7, 1995).[2] Meeting back with NC 143 Business, at Main Street, followed by US 129 split one-half mile (0.80 km) later continuing south towards Andrews; NC 143 continues east along Sweetwater Road out of town.[3]

The last 3.6 miles (5.8 km) of NC 143 feature steep elevation changes. From Orr Branch Road (elevation 2,300 feet (700 m)), the road climbs ups the southwestern side of the Cheoah Mountains. At Stechoah Gap, the NC 143 peaks at an elevation of 3,165 feet (965 m) (this is also where the Appalachian Trail meets). The highway goes north along the eastern side of the Cheoah Mountains, reaching NC 28 at Johnson Gap (elevation 2,523 feet (769 m)).[1][4]

In 1979, NC 143 was established as a new primary route between Robbinsville and Stecoah, on already existing roads. Topography maps of Graham County in the early 1990s show an incomplete Cherohala Skyway already numbered as NC 143; however, this was not official until October 12, 1996, when NC 147 was extended to a completed Cherohala Skyway and its current western terminus at the Tennessee state line.[6][7]

The Cherohala Skyway segment dates earlier than NC 143 (1962), but was not completed until 1996 with a total cost of $100 million over the whole 34 years of construction.[8]

This section needs to be updated. Please update this article to reflect recent events or newly available information.(March 2016)

NCDOT plans various safety improvements along NC 143, between West Buffalo Creek to NC 143 Business. The estimated cost for the entire project is $15.4 million with property acquisition starting August 2013 and construction to begin December 2014.[9]

NC 143 Business (NC 143 Bus.) is a business route of NC 143 established in February 1997. The 3.4-mile-long (5.5 km) route begins west of the town at NC 143 and travels east along Snowbird Road and through downtown Robbinsville via Junaluksa Road and Main Streets. It meets back with NC 143 and US 129 on Rodney Orr Bypass.[10] Historically, NC 143 has never been routed through Robbinsville; though US 129 did before the bypass.[6]